Hi all,
Well I just took the Zilard in for it's emmsion test here in Colorado Springs. We have a test here on the dyno for smoke. I only made 158 hp, the guy said something was wrong that most 96-97's make about 175 to 190 stock. What should I do first to get it back up to where it should be? What could be the problem? Fuel filter, air filter, fuel??????????
CH

 

well you have to look at the dyno and see if its a rear wheel dyno or a engine dyno the diffrenct is a rear wheel dyno is that you just drive it up on a set of rollers in the floor, and an engine dyno hooks directly to thew engine but the engine is out of the vehilce.
there should be a 20 to 25 percent loss though the driveline. its normal on all autos

 

Yah it's a chassis dyno, a Super Flow 601 with 36" rollers. he was comparing my truck to the 97 that was stock he did just before mine. it made 179 hp stock. with very little smoke. it has 180,000 miles on it too. The guy swore up and down that his is stock. we have to keep the cat on here in Colorado they check it at emisions testing. The tester said the exhaust is stock every thing under the hood was stock like mine. go figure. the tester said they all make about 170-190 at rear wheels. Mine only made 158 hp, at 6000 ft alt.

 

well from what i have heard..the stock powerstroke is making somwhere in the neighborhood of 200hp but i think that would be at the flywheel. but you have to factor in the 20 to 25 percent loss.. the easiest way to help your out would be to change all you fluids like fuel filter and air filter would be my first picks, i would change my air filter to an k&n. then i would change my engine oil just for preventave maint. the go to the tranny, and rear ends, that should help you out a little bit with the new air filters and fuel filters. if anything you have just made one happy good felling truck cause it has new fluids all the way around. and you know you have a peice of mind knowing that as well...

but if you still want more power i can tell you how to make it

step 1. get a mac air filtering system. more air in
step 2. remove exhaust and replace with 4 inch system from dynamax...more air out..be sure to get the downpipe thats where everything is
step 3.get chip from diablo. turns whimmpy motor into a beast
step4. get propane..cools egts,more hp,better fuel milage, and its bad a@#
step5. by this time you will need a stiffer clutch..look around and see what you can find on the net ..i dont know about them yet bc i havent changed mine yet
step 6 get bigger injectors. prefreably a set of marine inj.
take all of that and call me in the morning. if thats not enough come back for better recipie

 

I've seen stock Powerstrokes dyno anywhere from 150-195hp. To improve your output, a change of engine oil, a fresh fuel filter, and some Stanadyne in the fuel will help some. To take it beyond stock, replacing the restrictive air cleaner box with an open element system like the TYMAR will add a little. When I first went on a dyno, the other stock trucks were turning in the 170-180 range. I got on with only my TYMAR separating me from being totally stock, and I turned 195.

 

The 200HP you are quoting is not flywheel HP, but rear wheel power. The flywheel HP should be close to the factory number, and in some cases is slightly higher. If your engine is rated at 250HP from the factory, the flywheel HP is around 225.

I would DEFINATELY NOT recommend a K&N filter for any turbo diesel. Cummins specifically says NOT to use it on their engine because it does not filter well and can cause engine damage.

 

If your truck is an auto, you could be loosing torque in the tranny which would give a lower output at the wheels.

 

hey johnsdiesel,

if my diesel is rated at 250 then how can i have less hp at the flywheel then at the rear tire? or is the rating that the factory dives out just a round about number? i didnt know that about k&n filters what whould be a good system to use on my psd. what i have in mind would be the system from mac. i like the tubing they use ect.

 

The numbers I quoted earlier were for the early Powerstrokes, prior to the '99's, since that's what the original poster drives. The Superduties are a little higher, but the stronger specimens of the early 'Strokes put down more power than the weaker Super Duties.
My recommendation for an intake would be a TYMAR, which has been debated many times on this board. For maximum airflow, lowest restriction, and that invaluable "OH MY GOD!!!" appeal when people look under your hood, you can't beat the TYMAR.

 

What about the AFE intake. I just bought one new.
CH

 

dustyballs,

The rated hp numbers are at the flywheel, probably with no accessories. Rear whlle Hp takes into account turning the waterpump, alternator, power steering pump, vacum pump and all of the driveline. With these parasitic and friction losses the rear #s must be lower than the flywheel #s. HP is confusing because it is dependent upon torque and engine speed(RPM). Also at different times, the manufacturers had different rating methods for it. So International HP could be different than Cummins HP.

 

I think you misunderstood what I said. You will have HIGHER numbers at the flywheel which should reflect your factory HP and torque. The rear wheel numbers are lower, reflecting drivetrain loss.

BTW, the 250,225 numbers I used were a mistake. I just noticed that. I meant to type 250 and 250.

 

Zilard-
The AFE intake is also good, but it doesn't flow any more air than the TYMAR, and costs more. A lot of very strong trucks run an AFE, so you're in good company.

 

johnsdiesel,

that sounds good i thought it was a typo on your part about the 250 and 225. i uderstand why there is a lesser hp at the rear wheels. sorry for the confusion.